Eeek... I think having mom "stop in" during the day is a big no no. I wouldn't allow that at all. That's just about when you'll get him to settle, then here comes mom to stop in and run out the door again. I say go in cold turkey. Lots of personal attention, love and hugs, favorite foods etc. Let him cry if he's that upset.

I've sent pics to mom's cell phone mid day before. I let them know I don't do it as a rule, but on the first day they want to see their child adjusted and playing and it stops her from coming back. I also invite texts, phone calls and email during the day if they'd like a quick update.

Then again, at 20 months he could be so amazed by the other children and the new toys that he may not care at all.

I say, have mom explain the process to him in the car "your going to say with ... I'll be back after nap... " Then drop, kiss, hug and get out! Let you do your job. The crying won't last for long.

I break out the balloons on days like this and let the kids throw them around. They all love balloons... they're a great distraction.

Good luck! I love starting them at that age.